/*
 * Copyright 2017-2018 original authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.micronaut.aop.introduction;

import io.micronaut.aop.MethodInterceptor;
import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.core.type.MutableArgumentValue;

import javax.inject.Singleton;
import java.util.Iterator;

/**
 * @author Graeme Rocher
 * @since 1.0
 */
@Singleton
public class StubIntroducer implements MethodInterceptor<Object,Object> {

    public static final int POSITION = 0;

    @Override
    public int getOrder() {
        return POSITION;
    }

    @Override
    public Object intercept(MethodInvocationContext<Object, Object> context) {
        Iterator<MutableArgumentValue<?>> iterator = context.getParameters().values().iterator();
        if(iterator.hasNext())
            return iterator.next().getValue();
        return null;
    }
}
